1 files changed, 53 insertions, 0 deletions
diff --git a/include/drivers/delay_timer.h b/include/drivers/delay_timer.h
new file mode 100644
index 0000000..20a5543
--- /dev/null
+++ b/include/drivers/delay_timer.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2019, Linaro Limited
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef DELAY_TIMER_H
+#define DELAY_TIMER_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <arch_helpers.h>
+
+/********************************************************************
+ * A simple timer driver providing synchronous delay functionality.
+ * The driver must be initialized with a structure that provides a
+ * function pointer to return the timer value and a clock
+ * multiplier/divider. The ratio of the multiplier and the divider is
+ * the clock period in microseconds.
+ ********************************************************************/
+
+typedef struct timer_ops {
+	uint32_t (*get_timer_value)(void);
+	uint32_t clk_mult;
+	uint32_t clk_div;
+} timer_ops_t;
+
+static inline uint64_t timeout_cnt_us2cnt(uint32_t us)
+{
+	return ((uint64_t)us * (uint64_t)read_cntfrq_el0()) / 1000000ULL;
+}
+
+static inline uint64_t timeout_init_us(uint32_t us)
+{
+	uint64_t cnt = timeout_cnt_us2cnt(us);
+
+	cnt += read_cntpct_el0();
+
+	return cnt;
+}
+
+static inline bool timeout_elapsed(uint64_t expire_cnt)
+{
+	return read_cntpct_el0() > expire_cnt;
+}
+
+void mdelay(uint32_t msec);
+void udelay(uint32_t usec);
+void timer_init(const timer_ops_t *ops_ptr);
+
+#endif /* DELAY_TIMER_H */